SOLUTION: May is 15 years old. Five years ago, she was as old as her sister will be four years from now. How old is her sister?

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Question 1013886: May is 15 years old. Five years ago, she was as old as her sister will be four years from now. How old is her sister?
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Call her sister's age NOW, x.
Five years ago, May was 10. We can write
10 = x + 4
x = 6 years old